Ruby on Rails: Rails::HTML::Sanitizer.allowed_uri? returns true for entity-encoded control-character-split javascript: URLs

A vulnerability was discovered in the Rails::HTML::Sanitizer.alloweduri? method of the rails-html-sanitizer library. The method incorrectly returned true for entity-encoded control-character-split javascript: URLs, which could lead to potential security issues if the application relied on the...

Nextcloud: SMIL values and by attributes bypass remote image blocking via unvalidated resource-loading animations, enabling email tracking without consent

A vulnerability was discovered in the HTML sanitizer of the Roundcube webmail client. The vulnerability allowed attackers to bypass the "Block remote images" security feature by using SMIL animation attributes to load arbitrary external resources without validation. This could have enabled email...

PT-2026-23795

Name of the Vulnerable Software and Affected Versions league/commonmark versions prior to 2.8.1 Description The DisallowedRawHtml extension in league/commonmark can be bypassed by inserting ASCII whitespace characters between a disallowed HTML tag name and the closing ''. For example, would pass...

Gogs: Stored XSS via data URI in issue comments

Summary A Stored Cross-site Scripting XSS vulnerability exists in the comment and issue description functionality. The application's HTML sanitizer explicitly allows data: URI schemes, enabling authenticated users to inject arbitrary JavaScript execution via malicious links. Details The...

CVE-2026-25543

HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. Prior to versions 9.0.892 and 9.1.893-beta, if the template tag is allowed, its contents are not sanitized. The template tag is a special tag that does not usually render its...

CVE-2026-25543 HtmlSanitizer has a bypass via template tag

HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. Prior to versions 9.0.892 and 9.1.893-beta, if the template tag is allowed, its contents are not sanitized. The template tag is a special tag that does not usually render its...

Exploit for Cross-site Scripting in Typo3 Html_Sanitizer

Stored XSS exploit in TYPO3 HTML Sanitizer CVE-...

CVE-2022-23499

HTML sanitizer is written in PHP, aiming to provide XSS-safe markup based on explicitly allowed tags, attributes and values. In versions prior to 1.5.0 or 2.1.1, malicious markup used in a sequence with special HTML CDATA sections cannot be filtered and sanitized due to a parsing issue in the...

CVE-2024-34078

html-sanitizer is an allowlist-based HTML cleaner. If using keeptypographicwhitespace=False which is the default, the sanitizer normalizes unicode to the NFKC form at the end. Some unicode characters normalize to chevrons; this allows specially crafted HTML to escape sanitization. The problem has...

Nextcloud: SVG filter primitives bypass remote image blocking, enabling email tracking without consent.

A vulnerability was discovered in the HTML sanitizer of the Roundcube webmail application. The sanitizer did not properly handle the SVG filter primitive, allowing external resources to be loaded even when the "Block remote images" setting was enabled. This vulnerability could be used to track...

CVE-2025-61914

n8n is an open source workflow automation platform. Prior to version 1.114.0, a stored Cross-Site Scripting XSS vulnerability may occur in n8n when using the “Respond to Webhook” node. When this node responds with HTML content containing executable scripts, the payload may execute directly in the...

CVE-2025-61914 n8n's Possible Stored XSS in "Respond to Webhook" Node May Execute Outside iframe Sandbox

n8n is an open source workflow automation platform. Prior to version 1.114.0, a stored Cross-Site Scripting XSS vulnerability may occur in n8n when using the “Respond to Webhook” node. When this node responds with HTML content containing executable scripts, the payload may execute directly in the...

Cross-site Scripting (XSS)

Overview n8n is a n8n Workflow Automation Tool Affected versions of this package are vulnerable to Cross-site Scripting XSS via the Respond to Webhook node when it responds with HTML content containing executable scripts. An attacker can execute arbitrary JavaScript in the context of the editor...

Cross-site Scripting (XSS)

OWASP Java HTML Sanitizer is vulnerable to Cross-site Scripting XSS. The vulnerability is due to improper sanitization when HtmlPolicyBuilder permits noscript and style tags with allowTextIn, which allows an attacker to craft malicious CSS or HTML payloads that bypass the defined policy and execu...

Cross-site Scripting (XSS)

Overview Kentico.Xperience.AspNetCore.WebApp is an assemblies and content items required to integrate Kentico Xperience into ASP.NET Core applications. Affected versions of this package are vulnerable to Cross-site Scripting XSS through dangerous schemes allowed in the HtmlSanitizer class in the...

CVE-2025-68460

Roundcube Webmail is vulnerable to information disclosure in the HTML style sanitizer for releases before 1.5.12 and 1.6.x before 1.6.12. Multiple advisories (Debian DSA-6087, DLA-4415-1; Fedora packages roundcubemail 1.6.12; EUVD-2025-204036; NVD entry CVE-2025-68460) confirm the issue and point...

Improper Encoding or Escaping of Output

Overview Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output in the HTML style sanitizer module. An attacker can access sensitive information by crafting malicious HTML content that is improperly sanitized when viewed by a user. Remediation Upgrade...

Debian dla-4415 : roundcube - security update

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4415 advisory. ------------------------------------------------------------------------- Debian LTS Advisory DLA-4415-1 [email protected]...

anti-xss

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Roundcube Webmail Multiple Vulnerabilities (Dec 2025) - Linux

Roundcube Webmail is prone to multiple vulnerabilities. SPDX-FileCopyrightText: 2025 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only CPE = "cpe:/a:roundcube:webmail";...